Lee, I. F. (2018). Joyful: The surprising power of ordinary things to create extraordinary happiness.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLee, Ingrid Fetell. Joyful: The Surprising Power of Ordinary Things to Create Extraordinary Happiness. 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLee, Ingrid Fetell. Joyful: The Surprising Power of Ordinary Things to Create Extraordinary Happiness. 2018.
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